What’s Vulnerable › Vulnerabilities

CVE-2021-38198

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-08-08 · updated 2026-10-08

Description

arch/x86/kvm/mmu/paging_tmpl.h in the Linux kernel before 5.12.11 incorrectly computes the access permissions of a shadow page, leading to a missing guest protection page fault.

Affected products

• Debian Linux: 9.0
• Linux kernel: before 5.12.11 — fixed in 5.12.11

How to fix

Upgrade to a fixed version: Linux kernel 5.12.11. Check the vendor advisory for mitigations.

References

• https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.12.11
• https://github.com/torvalds/linux/commit/b1bd5cba3306691c771d558e94baa73e8b0b96b7
• https://lists.debian.org/debian-lts-announce/2021/10/msg00010.html
• https://lists.debian.org/debian-lts-announce/2021/12/msg00012.html
• https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.12.11
• https://github.com/torvalds/linux/commit/b1bd5cba3306691c771d558e94baa73e8b0b96b7
• https://lists.debian.org/debian-lts-announce/2021/10/msg00010.html
• https://lists.debian.org/debian-lts-announce/2021/12/msg00012.html

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